Synthetic lubricant basestock and an integrated fischer-tropsch process for its production
a technology of synthetic lubricant and basestock, applied in the direction of hydrocarbon oil cracking hydrocarbon oil treatment, etc., can solve the problems of complex and extensive branching, more pronounced adverse effect on the stability of the resulting base oil, and polyalphaolefins, which are significantly more expensive to produce than fischer-tropsch derived lubricant basestocks
Inactive Publication Date: 2005-01-27
SYNTROLEUM
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Benefits of technology
A baseoil composition produced by an integrated Fischer-Tropsch process comprising at least 40% of methyl branched hydrocarbons with
Problems solved by technology
However, acting on the branched paraffin components which are present in large quantities in mineral waxes, acidic dual function catalysts results in complex and extensive branching.
In contrast, the only way to influence these properties in hydroprocessed Fischer-Tropsch waxes, is to control the number of methyl branches along the straight chain which in contrast to long-chain branching has a more pronounced adverse effect on the stability of a resulting baseoil.
Polyalphaolefins, however, are significantly more expensive to produce than Fischer-Tropsch derived lubricant basestocks.
Therefore, such Fischer-Tropsch processes inherently have low yields because the necessary step of wax isomerization is accompanied by cracking, resulting in only 30% to 50% conversion of the wax Fischer-Tropsch product into lubricant basestock.
Fischer-Tropsch based synthetic lubricant basestocks, however, are heavily skewed to low viscosity components.
Moreover, lighter Fischer-Tropsch products generally have low olefin concentration and would therefore, yield little oligomerization product.
Finally, the olefin content which is present in lighter Fischer-Tropsch product streams generally have a relatively low ratio of alpha-olefins to internal-olefins, further complicating oligomerization and decreasing oligomerization yield.
Method used
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The term Cx, where x and y are numbers greater than zero, refers to hydrocarbon compound having predominantly a carbon number of x. As used herein, the term Cx may be modified by reference to a species of hydrocarbons, such as, for example, C5 olefins. In such instance, the term means an olefin comprised predominantly of pentene but which may have impurity amounts of olefins of other carbon numbers such as hexene, heptene, propene, or butene. The term Cx-Cy, where x and y are numbers greater than zero, refers to a mixture of hydrocarbon compounds wherein the predominant component hdyrocarbons have carbon numbers between x and y. For example, the term C5-C9 hydrocarbons means a mixture of hydrocarbon compounds which is predominantly comprised of hydrocarbons having carbon numbers between 5 and 9 but may also include impurity level quantities of hydrocarbons having other carbon numbers.
The term “branching index” (“BI”) means the percentage of methyl hydrogens. The term “DM” means t...
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Description
CROSS REFERENCE TO RELATED APPLICATIONS Not applicable. FEDERALLY SPONSORED RESEARCH Not applicable. REFERENCE TO MICROFICHE APPENDIX Not applicable. FIELD OF THE INVENTION The invention relates to a synthetic lubricant basestock and more particularly, to a lubricant basestock produced from an integrated Fischer-Tropsch synthesis and which provides both thermal and oxidative stability and good cold flow properties. The invention further relates to the integrated Fischer-Tropsch process for producing the synthetic lubricant basestock. BACKGROUND OF THE INVENTION Lubricant basestocks made from Fischer-Tropsch waxes are fundamentally different from lubricant basestocks available from any other source, including basestocks made from petroleum or mineral waxes, mineral wax hydrocracker and pipe still bottoms and those oligomerized from lower molecular weight petrochemicals or petroleum cuts. The first difference is the composition of the Fischer-Tropsch wax as compared to the compos...
Claims
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Login to View More IPC IPC(8): C07CC10G47/00C10G50/02C10G69/00C10G69/12
CPCC10G2400/10C10G50/02
Inventor ABAZAJIAN, ARMEN N.
Owner SYNTROLEUM